Fuse-case.



T. E. MURRAY.

FUSE CASE.

PPPPPPPPPPPPPPPPPP PT. 11,1911. 1,028,255, Patented June 4, 1912.

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'nnrmnbsrarne orraon- FUSE-CASE.

Specication of Letters Patent.

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Application filed. September. 11, 1911. Serial No. 648,796;

To all whom t may concern Be it known that I, THOMAS MURRAY, a citizenof the United States, residing at .New York, in the county of New Yorkand State of New York, have invented a certain new and usefulImprovement in Fuse-Cases, of which the following is a specification.

The invention is a fuse case and means for detachably connect-ing thesame to fixed circuit terminals on a suitablefsupport-the constructionbeing such as to permit of the use of a fuse case, or fuse therein,longer than the distance between the two fixed circuit terminals, toallow of said case being easily affixed to or removed from saidterminals, and to simplify and cheapen the manufacture of said case.

1n the accompanying drawings- Figure 1 is a longitudinal section of myfuse case and support, shown applied to a transformer, only one coil ofwhich is diagrammatically indicated. Fig. 2 shows the same, but adaptedto a transparent removable inner fuse case. Fig. 3 is a top view of theleft hand end of the outer fuse case of Fig. 2, and Fig. 4 is a faceView of said end.

Similar letters and numbers of reference indicate like parts. i

A represents the wall of a transformer casing, with ne coil of whichtransformer the fuse here shown may be connected in series. On said wallare two standards C, of refractory insulating material, in the ends ofwhich are metal clips D, connected to the transformer coil terminals byrods E.

The fuse case 1 comprises a tubular portion 2, of refractory insulatingmaterial, shouldered at its extremities to receive the plugs 3, 4, ofsimilar material, which may be cemented in place. The fuse strip 5 maybe connected at its ends to the contact plates 6, 7 which are heldbetween the plugs 3, 4 and the shoulders on the body portion 2 of thefuse case, and which are bent, as shown at 8, to extend for a distancelongitudinally inward through and so become embedded in the wall of saidbody portion. Entering said wall and engaging said bent portions 8 ofcontact plates 6, 7 are threaded rods 9, which enter the clips D whenthe device is in place on standards C.

ln assembling the device'gthefuse' strip 5 may be first connected tocontact plate 6 which 1s inserted in place in the body portion 2, andthe plug 4 at that end cemented in position. The opposite contact plate-7 is y then applied, the fuse strip fastened to it and the plug 3secured. The threaded rods 9 are then inserted` to engage contact plates6, 7, as already described.

In the form of my device shown in Fig. 2, the contact plate 6 is bentback on itself to forni a spring 10, the body portion being suitablyreeessedto receive the same. The opposite end wall of the body portion 2is formed integral with the peripheral wall, and is provided with aU-shaped opening 11, Fig. 4, having grooves 12 in its edges to re ceivethe sliding closing piece 13, Fig. 3. This construction adapts thedevice t0 an inner removable tubular fuse case 14 which is insertedthrough the U-shaped opening 11 until its end terminal 15 bears againstthe spring 10 of contact plate 6. The other lcontact plate 7 is then putin position to bear against the other end terminal 16, and

the sliding piece 13 finally closes the opening 11. The particular typeof inner removable fuse case here illustrated is that in which the fuseproper 17 is a block of material capable of fusing under predeterminedconditions and connected to a helical spring 18, which is normally undertension, but which when the fuse blows, contracts and so separates theruptured parts. The inner fuse case 14 is here made of glass, throughwhich internal conditions can be seen. For this last purpose an opening2O is made in the body portion 2.

l claim:

.1. A tubular case closed at both ends, contacts within said case on.the inner faces of the end closures thereof, parallel projections ofconducting material extending through and surrounded by the wall of saidcase at right angles to the central longitudinal axis thereof disposedin the same plane and located between and at distance from each of saidcontacts, and connections 4from said contacts to said projections.

`2. A tubular case closed at both ends, contacts within said case on theinner faces of the end closures thereof, parallel projections ofIconducting material extending lthrough and surrounded by the Wall ofsaid cse at In testimony whereof I lhave affixed my ight angles to thecentral longitudinal axis si maturo in resence of two witnesses.

1 f l' d h 1 p time() c pose 1n t e same p no and 1o- THOMAS E. MURRAY.

cated het een and at a distance from each of said contacts, andconnections from said Witnesses:

contacts to said. projections Wholly inc-losed GERTRUDE T. PORTER, inthe material of the wall of said case. MAY T. MGGARRY.

